CVE-2023-51766

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2023-51766
Exim before 4.97.1 allows SMTP smuggling in certain PIPELINING/CHUNKING configurations. Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because Exim supports <LF>.<CR><LF> but some other popular e-mail servers do not.

5.3 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
http://www.openwall.com/lists/oss-security/2023/12/24/1 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2023/12/25/1 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2023/12/29/2 Mailing List Mitigation Third Party Advisory
http://www.openwall.com/lists/oss-security/2024/01/01/1 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2024/01/01/2 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2024/01/01/3 Mailing List Third Party Advisory
https://bugs.exim.org/show_bug.cgi?id=3063 Issue Tracking Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2255852 Issue Tracking Third Party Advisory
https://exim.org/static/doc/security/CVE-2023-51766.txt Broken Link
https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html Technical Description
https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca Patch
https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5 Patch
https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766 Mitigation Vendor Advisory
https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/ Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/ Mailing List Third Party Advisory
https://lwn.net/Articles/956533/ Third Party Advisory
https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/ Technical Description Third Party Advisory
https://www.openwall.com/lists/oss-security/2023/12/23/2 Issue Tracking Mailing List Third Party Advisory
https://www.youtube.com/watch?v=V8KPV96g1To Exploit
http://www.openwall.com/lists/oss-security/2023/12/24/1 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2023/12/25/1 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2023/12/29/2 Mailing List Mitigation Third Party Advisory
http://www.openwall.com/lists/oss-security/2024/01/01/1 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2024/01/01/2 Mailing List Third Party Advisory
http://www.openwall.com/lists/oss-security/2024/01/01/3 Mailing List Third Party Advisory
https://bugs.exim.org/show_bug.cgi?id=3063 Issue Tracking Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2255852 Issue Tracking Third Party Advisory
https://exim.org/static/doc/security/CVE-2023-51766.txt Broken Link
https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html Technical Description
https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca Patch
https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5 Patch
https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766 Mitigation Vendor Advisory
https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/ Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/ Mailing List Third Party Advisory
https://lwn.net/Articles/956533/ Third Party Advisory
https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/ Technical Description Third Party Advisory
https://www.openwall.com/lists/oss-security/2023/12/23/2 Issue Tracking Mailing List Third Party Advisory
https://www.youtube.com/watch?v=V8KPV96g1To Exploit
Configurations

Configuration 1 (hide)

cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*

Configuration 3 (hide)

cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
History

21 Nov 2024, 08:38

Type Values Removed Values Added
References () http://www.openwall.com/lists/oss-security/2023/12/24/1 - Mailing List, Third Party Advisory () http://www.openwall.com/lists/oss-security/2023/12/24/1 - Mailing List, Third Party Advisory
References () http://www.openwall.com/lists/oss-security/2023/12/25/1 - Mailing List, Third Party Advisory () http://www.openwall.com/lists/oss-security/2023/12/25/1 - Mailing List, Third Party Advisory
References () http://www.openwall.com/lists/oss-security/2023/12/29/2 - Mailing List, Mitigation, Third Party Advisory () http://www.openwall.com/lists/oss-security/2023/12/29/2 - Mailing List, Mitigation, Third Party Advisory
References () http://www.openwall.com/lists/oss-security/2024/01/01/1 - Mailing List, Third Party Advisory () http://www.openwall.com/lists/oss-security/2024/01/01/1 - Mailing List, Third Party Advisory
References () http://www.openwall.com/lists/oss-security/2024/01/01/2 - Mailing List, Third Party Advisory () http://www.openwall.com/lists/oss-security/2024/01/01/2 - Mailing List, Third Party Advisory
References () http://www.openwall.com/lists/oss-security/2024/01/01/3 - Mailing List, Third Party Advisory () http://www.openwall.com/lists/oss-security/2024/01/01/3 - Mailing List, Third Party Advisory
References () https://bugs.exim.org/show_bug.cgi?id=3063 - Issue Tracking, Vendor Advisory () https://bugs.exim.org/show_bug.cgi?id=3063 - Issue Tracking, Vendor Advisory
References () https://bugzilla.redhat.com/show_bug.cgi?id=2255852 - Issue Tracking, Third Party Advisory () https://bugzilla.redhat.com/show_bug.cgi?id=2255852 - Issue Tracking, Third Party Advisory
References () https://exim.org/static/doc/security/CVE-2023-51766.txt - Broken Link () https://exim.org/static/doc/security/CVE-2023-51766.txt - Broken Link
References () https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html - Technical Description () https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html - Technical Description
References () https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca - Patch () https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca - Patch
References () https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5 - Patch () https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5 - Patch
References () https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766 - Mitigation, Vendor Advisory () https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766 - Mitigation, Vendor Advisory
References () https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html - Mailing List, Third Party Advisory () https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html - Mailing List, Third Party Advisory
References () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/ - Mailing List, Third Party Advisory () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/ - Mailing List, Third Party Advisory
References () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/ - Mailing List, Third Party Advisory () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/ - Mailing List, Third Party Advisory
References () https://lwn.net/Articles/956533/ - Third Party Advisory () https://lwn.net/Articles/956533/ - Third Party Advisory
References () https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/ - Technical Description, Third Party Advisory () https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/ - Technical Description, Third Party Advisory
References () https://www.openwall.com/lists/oss-security/2023/12/23/2 - Issue Tracking, Mailing List, Third Party Advisory () https://www.openwall.com/lists/oss-security/2023/12/23/2 - Issue Tracking, Mailing List, Third Party Advisory
References () https://www.youtube.com/watch?v=V8KPV96g1To - Exploit () https://www.youtube.com/watch?v=V8KPV96g1To - Exploit

02 Feb 2024, 02:22

Type Values Removed Values Added
CPE cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
References () https://lwn.net/Articles/956533/ - () https://lwn.net/Articles/956533/ - Third Party Advisory
References () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/ - () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/ - Mailing List, Third Party Advisory
References () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/ - () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/ - Mailing List, Third Party Advisory
References () https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html - () https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html - Mailing List, Third Party Advisory
References () https://www.youtube.com/watch?v=V8KPV96g1To - () https://www.youtube.com/watch?v=V8KPV96g1To - Exploit
CVSS v2 : unknown
v3 : 4.3 		v2 : unknown
v3 : 5.3
First Time Debian
Debian debian Linux

18 Jan 2024, 03:15

Type Values Removed Values Added
References
  • () https://lwn.net/Articles/956533/ -

12 Jan 2024, 03:15

Type Values Removed Values Added
References
  • () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORN7OKEQPPBKUHYRQ6LR5PSNBQVDHAWB/ -
  • () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPDWHJPABVJCXDSNELSSVTIVAJU2MDUQ/ -

05 Jan 2024, 23:15

Type Values Removed Values Added
References
  • () https://lists.debian.org/debian-lts-announce/2024/01/msg00002.html -

04 Jan 2024, 18:15

Type Values Removed Values Added
References
  • () https://www.youtube.com/watch?v=V8KPV96g1To -

04 Jan 2024, 16:23

Type Values Removed Values Added
CWE CWE-345
References () https://bugs.exim.org/show_bug.cgi?id=3063 - () https://bugs.exim.org/show_bug.cgi?id=3063 - Issue Tracking, Vendor Advisory
References () https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/ - () https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/ - Technical Description, Third Party Advisory
References () http://www.openwall.com/lists/oss-security/2023/12/29/2 - () http://www.openwall.com/lists/oss-security/2023/12/29/2 - Mailing List, Mitigation, Third Party Advisory
References () https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca - () https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca - Patch
References () http://www.openwall.com/lists/oss-security/2024/01/01/2 - () http://www.openwall.com/lists/oss-security/2024/01/01/2 - Mailing List, Third Party Advisory
References () https://exim.org/static/doc/security/CVE-2023-51766.txt - () https://exim.org/static/doc/security/CVE-2023-51766.txt - Broken Link
References () https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766 - () https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766 - Mitigation, Vendor Advisory
References () http://www.openwall.com/lists/oss-security/2023/12/24/1 - () http://www.openwall.com/lists/oss-security/2023/12/24/1 - Mailing List, Third Party Advisory
References () https://bugzilla.redhat.com/show_bug.cgi?id=2255852 - () https://bugzilla.redhat.com/show_bug.cgi?id=2255852 - Issue Tracking, Third Party Advisory
References () https://www.openwall.com/lists/oss-security/2023/12/23/2 - () https://www.openwall.com/lists/oss-security/2023/12/23/2 - Issue Tracking, Mailing List, Third Party Advisory
References () https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html - () https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html - Technical Description
References () http://www.openwall.com/lists/oss-security/2024/01/01/1 - () http://www.openwall.com/lists/oss-security/2024/01/01/1 - Mailing List, Third Party Advisory
References () http://www.openwall.com/lists/oss-security/2024/01/01/3 - () http://www.openwall.com/lists/oss-security/2024/01/01/3 - Mailing List, Third Party Advisory
References () https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5 - () https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5 - Patch
References () http://www.openwall.com/lists/oss-security/2023/12/25/1 - () http://www.openwall.com/lists/oss-security/2023/12/25/1 - Mailing List, Third Party Advisory
CPE cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*
cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:a:fedoraproject:extra_packages_for_enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 4.3
First Time Exim exim
Fedoraproject extra Packages For Enterprise Linux
Fedoraproject
Fedoraproject fedora
Exim

02 Jan 2024, 01:15

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2024/01/01/3 -

01 Jan 2024, 21:15

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2024/01/01/2 -

01 Jan 2024, 18:15

Type Values Removed Values Added
Summary Exim through 4.97 allows SMTP smuggling in certain configurations. Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because Exim supports <LF>.<CR><LF> but some other popular e-mail servers do not. Exim before 4.97.1 allows SMTP smuggling in certain PIPELINING/CHUNKING configurations. Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because Exim supports <LF>.<CR><LF> but some other popular e-mail servers do not.
References
  • () http://www.openwall.com/lists/oss-security/2024/01/01/1 -
  • () https://github.com/Exim/exim/blob/master/doc/doc-txt/cve-2023-51766 -

29 Dec 2023, 15:15

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2023/12/29/2 -

26 Dec 2023, 21:15

Type Values Removed Values Added
References
  • () https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html -

26 Dec 2023, 16:15

Type Values Removed Values Added
References
  • () https://bugzilla.redhat.com/show_bug.cgi?id=2255852 -
  • () https://git.exim.org/exim.git/commit/cf1376206284f2a4f11e32d931d4aade34c206c5 -
  • () http://www.openwall.com/lists/oss-security/2023/12/25/1 -
  • () https://git.exim.org/exim.git/commit/5bb786d5ad568a88d50d15452aacc8404047e5ca -
Summary Exim through 4.97 allows SMTP smuggling in certain configurations. Remote attackers can use a published exploitation technique to inject e-mail messages that appear to originate from the Exim server, allowing bypass of an SPF protection mechanism. This occurs because Exim supports <LF>.<CR><LF> but some other popular e-mail servers do not. Exim through 4.97 allows SMTP smuggling in certain configurations. Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because Exim supports <LF>.<CR><LF> but some other popular e-mail servers do not.

24 Dec 2023, 12:15

Type Values Removed Values Added
References
  • () http://www.openwall.com/lists/oss-security/2023/12/24/1 -

24 Dec 2023, 06:15

Type Values Removed Values Added
New CVE
Information

Published : 2023-12-24 06:15

Updated : 2024-11-21 08:38

NVD link : CVE-2023-51766

Mitre link : CVE-2023-51766

CVE.ORG link : CVE-2023-51766

JSON object : View

Products Affected

fedoraproject

  • extra_packages_for_enterprise_linux
  • fedora

debian

  • debian_linux

exim

  • exim
CWE
CWE-345

Insufficient Verification of Data Authenticity